PlayOnBSD for default pkg

You mean installed by default in every GhostBSD installation? I don't think that this is a good idea. It is very easy to install it for those who want it and it makes no sense to force this on people who don't need it at all.

At some point in time package selection (or rather: profiles) would be a nice feature for the installer. A "gaming" profile would be a sensible option to add and certainly PlayOnBSD should be part of that. However there are much more essential things that need to be done to the installer first.